SMITHSONIAN MISCELLANEOUS COLLECTIONS
VOLUME 56. NUMBER 17
NEW SPECIES OF RODENTS AND CARNI-
VORES FROM EQUATORIAL AFRICA
Naturalist, Smithsonian African Expedition
CITY OF WASHINGTON
PUBLISHED BY THE SMITHSONIAN INSTITUTION
February 28, 1911
NEW SPECIES OF RODENTS AND CARNIVORES FROM
By EDMUND HELLER
Naturalist, Smithsonian African Expedition*
Further study of the mammals collected by the Smithsonian
African Expedition has made necessary the description of twenty-
one additional new forms which are dealt with in the present paper.
The bulk of these new forms are from Rhino Camp, in the Lado
Enclave. The specimens in the collection are the first which have
been obtained in this unknown region. The Lado Enclave com-
prises the Nile watershed lying west of the Upper Nile (Bahr-el-
Jebel). The precise geographical position of Rhino Camp is lati-
tude 2° 55' north, on the west bank of the Nile some fifteen miles
north of the station of Wadelai.
This paper is the thirteenth dealing with the results of the expe-
dition. Incidentally a new Lophuromys from West Africa is here
HELIOSCIURUS MULTICOLOR MADOG^I, new subspecies
Nimule Tree Squirrel
Type from Uma (50 miles north of Nimule), Uganda; adult
male, number 164828, U. S. Nat. Mus. ; collected by Kermit Roose -
velt, February 11, 1910; Loring number, 8991.
Characters . — Size of lateris , but coloration distinctively buffy, the
feet and under parts pure buffy yellow.
Coloration . — General coloration of upper parts mixed buffy, gray-
ish, and black ; individual hairs annulated, basally black, then ochra-
ceous, followed by a broad band of black and then by a narrower
subterminal band of grayish buff and terminated by a black tip.
Eyes with a broad whitish eye-rmg, cheeks and feet buffy. Tail
annulated with buffy and black bands of equal width. Under parts
and inside of limbs buffy ; under side of tail basally, and anal region,
tawny rufous in marked contrast to rest of under parts.
Measurements . — Head and body, 202 mm.; tail, 204; hind foot,
44. Skull: condylo-incisive length, 41.5; basilar length, 35; zygo-
matic breadth, 27.5; interorbital v T idth, 13.5; length of nasals, 14;
upper toothrow, 9; condylo-incisive length of mandible, 30.5.
Smithsonian Miscellaneous Collections, Vol. 56, No. 17
2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5&
This form of the widespread multicolor group is decidedly more
buffy than its Lado ally, later is, approaching more the color of
elegans of Mr. Elgon. It is, however, distinctly smaller than this
form and somewhat yellower.
The type is the only specimen in the collection. This was secured
by Kermit Roosevelt in a clump of bamboo near the village of Uma.
PARAXERUS KAHARI, new species
Meru Forest Squirrel
Type from Meru Boma, northeast of Mt. Kenia, British East
Africa; adult female, number 164203, U. S. Nat. Mus. ; collected
by Edmund Heller, September 24, 1909; original number, 1174.
Characters. — Like ganana, but tail without rusty median stripe;
skull larger and proportionately broader.
Coloration . — General dorsal coloration buffy olive, darkest me-
dially, becoming lighter and more buffy on the sides; individual
hairs annulated by a narrow subterminal band of buff; overlaid by
longer wholly black hairs ; dark area of back bordered by an obso-
lete lighter stripe. Eye with a broad buffy ring. Cheeks and lower
sides olive buff. Feet above ochraceous. Ears like dorsum. Tail
mixed blackish and buffy, without marked darker cross-bands, the
border light buffy ; below more yellowish buffy. Under parts cream
buff, the hair on median line buffy to the roots.
Measurements. — Head and body, 175 mm.; tail, 172; hind foot, 38.
Skull: condylo-incisive length, 36.5; basilar length, 31.5; zygomatic
breadth, 24.5; interorbital width, 11.5; length of upper toothrow,
7.3 ; condylo-incisive length of mandible, 27.5.
This race is closely allied to ganana of Jubaland. Specimens
from the northern Guaso Nyiro River are exactly like the type in
body coloration, but are somewhat smaller skulled. In coloration
of upper parts this race is similar to ochraceus from Mombasa, but
the coast species is at once distinguishable by its bright ochraceous
Among the Wameru tribe this squirrel is known as kahari.
GRAPHIURUS PERSONATUS, new species
Type from Rhino Camp, Lado Enclave; adult female, number
164827, U. S. Nat. Mus.; collected by J. Alden Loring, January n,
1910; original number, 8644.
NO. 17 NEW SPECIES OE EAST AFRICAN RODENTS — HEEEER 3
Characters. — Dorsal coloration buffy, as in lorraineus, but size
Coloration.— General dorsal colors buffy, overlaid by sepia, the
buffy purer on sides and head and sharply defined against the gray
of the under parts. Eye surrounded by a narrow black ring, which
is continuous with a black streak to the tip of the snout. Cheeks
creamy buff to level of eyes, where some fulvous separates it from
the darker color of the upper parts; this light creamy color ascends
behind ears and appears above them as a whitish tuft above each
ear. Under parts grayish, washed with pale primrose yellow.
Fore feet whitish, hind limbs broccoli brown like the tail; the toes
and sides of the feet white. Tail above broccoli brown, the hairs
lightening at tip and forming a light border; under surface lighter
grayish or brown, but darkening toward tip, where it is the color
of the upper surface.
Measurements. — Head and body, 82 mm.; tail, 63; hind foot, 14;
ear, 10. Skull: condylo-nasal length, 23; zygomatic breadth, 13.5;
length of nasals, 8.5 ; interorbital width, 4.3 ; length of upper tooth-
Skull smaller than lorraineus , with shorter snout and smaller
teeth. This species resembles lorraineus most closely in color and
size. From smithii , which is about the same size, it differs widely
in color, being buffy instead of grayish, with a distinct black eye-
There is but a single specimen in the collection.
DENDROMUS SPECTABILIS, new species
Nii,e Biack-fronted Tree Mouse
Type from Rhino Camp, Lado Enclave ; adult female, number
164815, U. S. Nat. Mus.; collected by J. Alden Coring, January 18,
1910; original number, 8783.
Characters. — Like nigrifrons , but lighter, the under parts pearl
gray; feet whitish and the upper parts cinnamon fawn.
Coloration. — Color of upper parts cinnamon fawn, changing on
lower sides and head to tawny buff, but not sharply defined against
the pearl gray of the under parts ; a wide black median dorsal line
from shoulders to root of tail, widest anteriorly and narrowing
gradually posteriorly ; a median black spot on forehead midway
between eye and ear. Snout lighter than rest of head, pure buffy
yellow; base of whiskers and area between eye and tip of snout
SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. $6
blackish. A few white hairs at anterior base of ears and a larger
white patch immediately below ear. Ears dark seal brown with a
few silvery hairs on inside. Eeet whitish. Lower parts pearl gray,
the hair basally slate gray except on chin, throat, and under lip,
which are white; median line of belly buffy. Tail dusky brown all
around, essentially naked.
Measurements . — Head and body, 68 mm. ; tail, y8 ; hind foot, 17-5*
Skull: greatest length, 21; condylo-incisive length, 18.5; zygomatic
breadth, 11.8; nasals, 7.5; diastema, 5; length of upper molar series,
3.1 ; condylo-incisive length of mandible, 12.
This species is allied to nigrifrons , but is readily distinguishable
by its lack of buffy under parts and whitish feet. The series of
eight topotypes shows very little variation in the color of the under
DENDROMUS LINEATUS, new species
Lado Tree Mouse
Type from Rhino Camp, Lado Enclave; adult male, number
164816, U. S. Nat. Mus.; collected by J. Alden Loring, February 1,
1910; original number, 8921.
Characters — Size of jamesoni and coloration of ochropus , with
short ears and small skull and feet.
Coloration . — Upper parts tawny ochraceous, lighter on the sides,
ochraceous where the color is well defined against the white of the
under parts; head lighter than body, ears darker umber-brown; a
wide black median stripe extending from the shoulders to the base
of the tail. Fore feet and under parts pure white, the hair white
to the roots. Tail bicolor, dusky brown above, white below.
Measurements . — Head and body, 65 mm.; tail, 87; hind foot,
16.5. Skull: greatest length, 20; basilar length, 14.5; condylo-
incisive length, 17.2; zygomatic breadth, 10; nasals, 7.2; diastema,
5 ; length of upper toothrow, 3.5 ; condylo-incisive length of mandi-
ble, 1 1.5.
Twelve topotypes are in the collection. This series shows great
variation in the distinctness of the black median dorsal stripe. In
seven of these it is well defined, but in the remaining five there are
all degrees of obsoleteness down to specimens which show only a
very faint trace.
Dendromus jamesoni of the Transvaal seems to be a close ally of
this species, the chief differences separating the two forms being
the lesser zygomatic width of the skull and the smaller ear of the
NO. 1 7 NEW SPECIES OF EAST AFRICAN RODENTS — HEELER 5
Nile species. This new form approaches ochropus of British East
Africa closer than any other equatorial species. From this species
it is readily separable by the white under parts and the bicolored
tail, and also by slightly smaller skull and feet.
Two other specimens, both with stripe obsolete, are in the collec-
tion from Iloima and Gondokoro, Uganda.
MUS MUSCULOIDES EMESI, new subspecies
Uganda Pygmy Mouse
Type from Kabula Muliro, Uganda; adult male, number 164819,
U. S. Nat. Mus. ; collected by J. Alden Loring, December 27, 1909;
original number, 8497.
Characters. — Dorsal coloration similar to murillus; hair of under
parts white to the roots ; body size less, with proportionately smaller
Coloration. — Median dorsal area blackish, sparingly flecked with
tawny; sides lighter and more tawny, the lower sides well defined
against the white of the under parts by a narrow band of fulvous ;
dorsal pelage composed of black hairs annulated with tawny and of
scattered wholly black hairs. Limbs like sides, ears and dorsal sur-
face of tail blackish and clothed by minute hairs. Feet and under
parts white, the hair white to the roots. Lower side of tail whitish.
Measurements. — Head and body, 71 mm.; tail, 51; foot, 13.5.
Skull: greatest length, 20.1; condylo- incisive length, 18.5; nasal,
7.9; zygomatic breadth, 10.5; palatal foramina, 4.4; upper molar
Skull similar to murillus and to the members of the musculoides
group generally, having the masseter knob and anterior cusp of
m 1 little pronounced. This is a small white-bellied Nile race of the
widespread musculoides group.
The series of nine topotypes shows considerable variation in dor-
sal coloration, ranging from the dark color of the type to a rufous
phase. A specimen taken at Hoima, Uganda, is also referable to
this new form.
MUS WAMiE, new species
Long-snouted Pygmy Mouse
Type from Kapiti Plains, British East Africa; adult female,
number 161777, U. S. Nat. Mus.; collected by J. Alden Loring,
May 6, 1909; original number, 6061.
6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56
Characters. — Long snouted like sorellus , but snout longer, the
nasal bones measuring 8.5 mm. in length; upper parts much lighter,
Coloration. — Median dorsal region from eyes to base of tail ochra-
ceous-buff, heavily lined with black; snout and sides of head and
body from level of eyes purer ochraceous-buff, changing to fulvous
on lower sides where this color meets the white of the under parts.
Ears hair brown, an ill-defined white spot at their base. Tail nearly
naked ; light brownish above, whitish below. Under parts, feet,
and snout from level of nose, white ; the hair white to the roots.
Measurements. — Head and body, 68 mm.; tail, 40; foot, 15.
Skull: occipito-incisive (greatest) length, 20.5; condylo-incisive
length, 20; length of nasals, 8.5; width of interorbital constriction,
3.2; length of palatal foramina, 5.4; width of brain case, 9; length
of upper molar series, 3.6.
This species is closely allied to sorellus, with which it agrees in
the peculiar elongate snout and straight projecting incisors, and
also in general proportions of body. Sorellus is, however, only
distantly related to grains , but shows close relationship to tenellus
in the formation of the short, narrowed mesopterygoid region,
straight incisors and short tail. The group to which this species
belongs represents the extreme divergence of the African Leggadas
from the Mus muscitlits group in skull characters. This differ-
ence from the type species of Mus is most marked in the straight,
projecting incisors, the elongate snout, the abbreviated, narrow,
mesopterygoid fossa, and the minute coronoid process of the man-
dible. In the two latter characters these long-snouted African Mus
approach somewhat the skull condition exhibited by Acomys.
This is rather a rare species, being represented by only one skin
and one alcoholic specimen in the collection, which contains some
hundred specimens of Leggadas from British East Africa.
MUS TENELLUS ACHOLI, new subspecies
Long-snouted Pygmy Mouse
Type from Rhino Camp, Lado Enclave; adult male, number
164817, 1 T . S. Nat. Mus.: collected by J. Alden Loring, January 13,
1910; original number, 8671.
Characters. — Coloration of tenellus , but size much larger, with
large skull and proportionately short tail.
Coloration. — Median dorsal area mixed blackish and fulvous, the
NO. 1 7 NEW SPECIES OE EAST AFRICAN RODENTS — HEEEER
snout and posterior rump more fulvous; sides pure fulvous, fairly
well defined against the dark dorsal area and the white of the under
parts; limbs fulvous like the sides. Ears blackish, covered spar-
ingly by minute grayish hairs. A conspicuous white subaural patch.
Feet and under parts white, the hair white to the base. Tail hair
brown above, whitish below, closely covered by short stiff hairs
which hide the annuli.
Measurements. — Head and body, 68 mm.; tail, 36; foot, 13.
Skull: greatest length, 20.5; condylo-incisive length, 19; zygomatic
breadth, 10; palatal length, 11; nasals, 8; length of upper molar
series, 3.3; palatine foramina, 5.
This is a larger race of the tenellus group of the Lower Sudan,
of which it is the extreme in size. From snahelica of the Kiliman-
jaro region this species differs widely in its much larger . size and
lighter coloration. The tenellus group is welt defined by its long
snout, projecting incisors, and short hairy tail. Three other speci-
mens are in the collection from the type locality.
MUS GRATUS SUNGAR7E, new subspecies
Kenia Pygmy Mouse
Type from West Kenia Forest Station, altitude 7,500 feet; old
male, number 163487, U. S. Nat. Mus. ; collected by J. Alden Lor-
ing, September 20, 1909 ; original number, 7425.
Characters. — Like gratus, but larger and lighter colored, with
the central dark area better defined.
Coloration. — Median dorsal area from snout to base of tail mixed
blackish and tawny in about equal parts ; sides lighter, purer tawny,
changing somewhat abruptly from the dark dorsal region ; bounded
on lower sides where the sides meet the white of the under parts by
a fulvous line. Ears hair brown. Tail dark brown above, light
brown below. Under parts and feet white, the hair white to the
Measurements. — Head and body, 70 mm.; tail, 60; hind foot,
14.5. Skull: occipito-nasal (greatest) length, 19.5; condylo-incisive
length, 18.2; basilar length, 15.5; zygomatic breadth, 10; length of
nasals, 7.2; length of palatal foramina, 4.9; length of upper tooth-
The material of this form in the collection is quite extensive.
From the type locality there are six specimens, ten from Nyeri,
seven from Waubugus, and eight from Naivasha. There is con-
8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56
siderable variation due to age, the young usually having the under
parts quite huffy with the hair basally plumbeous, the pure white
under parts being acquired only in old adults.
MUS BELLUS GONDOKORiE, new subspecies
Gondokoro Pygmy Mouse
Type from Gondokoro. Uganda; adult male, number 164820, U. S.
Nat. Mus. ; collected by J. Alden Loring, February 25, 1910; orig-
inal number, 9089.
Characters . — Smaller and lighter colored than bellns , with the
subaural white spot well defined.
Coloration . — Median dorsal area from eyes to posterior rump
hair brown, much lighter than the fulvous sides against which it is
not well defined ; snout, area about eye, limbs, and sides of body
bright fulvous, sharply contrasted with the white of the under parts.
Ears hair brown like back. Under parts, tip of snout, and lips and
feet, white ; the hair white to the roots. Tail brown above, lighter
and whiter below.
Measurements . — Head and body, 60 mm.; tail, 43; hind foot, 13.
Skull: greatest length, 17.6; condylo-incisive length, 16; zygomatic
breadth, 9.4; nasal, 63; length of upper toothrow, 3.
The type is the only specimen in the collection.
MUS BELLUS ENCLAVE new subspecies
Enclave Pygmy Mouse
Type from Rhino Camp, Lado Enclave ; adult male, number
164818, U. S. Nat. Mus.; collected by J. Alden Loring, January 10,
1910; original number, 8613.
Characters . — Size of bclhts , but dorsal coloration much darker,
the sides nearly as dark as the median region.
Coloration. — L T pper parts blackish, the median region very spar-
ingly flecked with tawny; sides more tawny, about equally mixed
broccoli brown and tawny; snout dorsally blackish to tip, sides of
head and snout tawny ochraceous, enclosing the eye on lower and
posterior side only, the buffy eye-ring being broken above by the
blackish suffusion of the head. Ears hair brown, with an indistinct
white patch at their base. Tail dark brown above, lighter brownish
below. Under parts from level of nostrils and feet white, the hair
white to the base.
NO. 17 NEW SPECIES OF EAST AFRICAN RODENTS — HEEEER
Measurements. — Head and body, 64 mm.; tail, 46; hind foot, 13.
Skull: occipito-nasal (greatest) length, 18; condylo-incisive length,
16.5 ; length of nasals, 6.2 ; zygomatic breadth, 9.2 ; palatal foramina,
4.3; length of upper toothrow, 3.1.
This is a dark form of the widespread bellus . A series of thir-
teen from Rhino Camp show very little variation in the dark upper
parts and are readily distinguishable from the light sided bellus ,
with its sharply defined dark dorsal area.
ARVICANTHIS PULCHELLUS MICROPUS, new subspecies
Lado Striped Grass Rat
Type from Rhino Camp, Lado Enclave; adult female, number
164825, U. S. Nat. Mus.; collected by J. Alden Loring. January 24,
1910; original number, 8861.
Characters. — Closely allied to massaicus, but feet smaller and
Coloration. — General dorsal coloration bistre brown; the back
marked by ten parallel lines of ochraceous spots, the central pair
enclosing a median black dorsal line ; sides lighter and more grayish,
the spots light buffy. Feet and ears ochraceous. Tail blackish
above, buffy on sides and below. Under parts cream buff, the hair
uniform to the roots.
Measurements.— Uezd and body, 114 mm.; tail, 125; hind foot,
23. Skull : condylo-incisive length, 25 ; zygomatic breadth, 23.5 ;
nasals, 11x3; diastema, 7 ; length of upper toothrow, 5.2 ; length of
bullae, 5 ; condylo-incisive length of mandible, 18.
There are eleven topotypes in the collection. In color these range
from the grayish color of massaicus to a buffy tint similar to ardeus.
A series from Uganda, taken along the route from Kampala to
Butiaba, agree in the small size of their feet and in color with the
types series. One specimen from Gondokoro has the spots so
coalesced as to form lines as in barbarus , from which it is not dis-
tinguished except in the flatter skull and darker olivaceous body
ARVICANTHIS JEBELiE, new species
WhiTE-bElliEd Grass Rat
Type from Rhino Camp, Lado Enclave; number 164826, U. S.
Nat. Mus.; collected by J. Alden Loring. January 16, 1910; original
SMITHSONIAN M 1 SCI'IJ.A N tfOUS COU.KCTlONS
Characters 'Pail long, length equaling head and body or greater;
nasal bones slightly concave along lateral edges; upper parts tawny
ocliraccous, lower parts white.
Coloration . — Upper parts tawny ocliraccous, sparingly lined by
black; purer ocliraccous on sides, the color extending low down on
sides of belly, but not sharply defined against the* white under parts;
pelage made up of narrowly seal brown tipped hairs with a broad
baud of ocliraccous followed by slate to the base, the subterminal
ocliraccous band giving the pelage its color character; interspersed
with these annulated hairs are longer black ones, which give the
median dorsal area a lined effect. Eyes with an ill-defined lmfTy
ring. Ears chiefly ocliraccous, with a few black hairs about the
base and on the inner side. Feet ocliraccous. Tail with a broad
dorsal band of black, the sides huffy and the lower surface whitish.
Under parts white, the hair white almost to the roots, the base ashy
gray; on chin, lips, throat, and thighs the hair is white to the roots.
Measurements . — Head and body, 140 mm.; tail, 150; hind foot,
29. Skull: condylo-incisivc length, 31.5 ; greatest length, 35.5;
zygomatic breadth, 17; interorbital constriction, 5; nasals, 12.5x4;
length of upper row, 6.5; diastema, 8.2; length of palatine foram-
ina, 5.5; length of bnlke, 5.6; condylo-incisivc length of mandible, 22.
This species occurs at its type locality with rnbcsccns , both being
forms of the abyssiniens group. Roth forms occur about Gondo-
koro also. The color differences from the dark-bellied, shorter-
tailed rubcscetis are marked, but the skull differences consist of only
average characters, such as the slight concavity to the edges of the
nasal hones and the lack of heading to the anterior part of the in-
The type locality is represented by a series of twenty- four skins
in which are specimens of all ages, but the variation in color is very
little. The relationship between length of head and body and the
length of the tail in this scries shows the following proportion :
tail longer than head and body, 8 specimens; tail equal to head and
body, 6 specimens; tail slightly shorter than head and body, 10
LOPHUROMYS PYRRHUS, new species
Lado IIarsii -furred Mouse
l'vpc from Rhino Camp, l v ado Enclave; adult male, number
161823, S. Nat. Alus.; collected by J. Aldcn Eoring, January 24,
1910; original number, 8853.
NO. 17 Nl'AV SPlvClKS or IvAST AFRICAN RODENTS — IM'XU.R
Characters — Size large, skull Imig-snoutcd ; under parts bright
Coloration. — lJp]>er parts uniform seal brown, becoming lighter
only on lower sides where the coloration merges gradually from
fourth limber (o the cinnamon rufous of the belly. Feet lighter than
back, vaudyke brown. Tail quite blackish above and on the sides,
the median under surface becoming lighter. Under fur of upper
parts chestnut brown. Under parts from chin to base of tail bright
cinnamon rufous, the color uniform to the roots of the hair.
Measurements . — Head and body, 136 mm.; tail, 7 2; hind foot,
22.5. Skull ; condylo incisive length, 31 ; basilar length, 2 7; zygo-
matic breadth, 15.5; inlerorbital width, 0.7; length of nasals, 14;
length of upper tooth row, 5; condylo-iucisivc length of mandible,
Compared to imsorgei of the Kavirondo country of British East
Africa, this form has the under parts much brighter red, the in-
tensity of the red persisting through old age. Sikapusi, which has
the same bright under parts, is a smaller race with a decidedly
broader skull, with shorter, more convex nasal bones.
LOPHUROMYS NUDICAUDUS, new species
Type from Kfulcu, lUda country, Kamcrun ; adult male, number
125436, U. S. Nat. Mus.; collected by (). U. Bates, August 4, iQ° 3 >
original number, 26.
Characters. Tail essentially naked, the annulations conspicuous;
hair very harsh; skull with small flattened hnllrc and shortened brain
case, the parietal bones short.
Coloration . — Upper parts uniform seal brown, the hair uniform
in color to the roots on median line, but lightening on sides. Feet
Vandyke brown. Under parts chiefly cinnamon rufous, the chest
orange rufous. Tail quite naked, with distinct annulations, uni-
form deep seal brown in color.
Measurements . — Total length, 166 inm. ; tail (skin), 60; foot,
18.5. Skull: condylo-incisivc length, 25; basilar length, 21; zygo-
matic width, 13.5 (approximate) ; interorhital width, 6.5; length of
nasals, ti.6; length of upper toothrow, 4.4; condylo-incisivc length
of mandible, 17.3.
'Phis is a small species of Cophnromys and differs from the other
described species in its very much harsher fur and essentially naked
SMITHSONIAN MISCELLANEOUS COLLECTIONS
URANOMYS UGANME, new species
Uganda Big-toothed Mouse
Type from Kikonda, Uganda; adult male, number 164822, U. S.
Nat. Mus. ; collected by J. Alden Loring, January 2, 1910; original
Specific characters. — Most closely related to ruddi of the Mount
Elgon District of British East Africa. Differs decidedly in the
shorter and narrower skull and the shorter nasal bones. Size
smaller and coloration of under parts without any pinkish wash.
Coloration. — Median portion of head and body above sepia flecked
minutely with light brown, changing gradually on sides of head and
body to a fulvous flecked with sepia. Under parts light grayish
with a buffy wash. Fore and hind limbs with the color of the
sides, except the feet, which are white. Tail dusky brownish above,
becoming somewhat lighter below.
Measurements. — Head and body, 101 mm.; tail, 75; hind foot, 18;
ear, 12. Skull: greatest length, 27; condylo-basal length, 25; zygo-
matic breadth, 14.5; nasals, 7.5 x 3.5 ; upper toothrow, 4.5; palatal
The skull of this genus is very close to Acomys in structure, the
palatal region especially being similar, but externally this species
can be scarcely distinguished from Lophuromys aquilas, with which
it is found associated. The collection contains but a single speci-
men. The teeth in this individual are quite worn, so that the tuber-
cular structure cannot be made out. Compared with skulls of equal
age of Lophuromys and Acomys , the m 3 is found to lack the minute
posterior median cusp which is found in both these genera. The
structure of the floor of the skull closely resembles Acomys. The
depressions marking the termination of the bony palate are, how-
ever, much deeper and have prominent margins, the interpterygoid
fossa is wider and has parallel sides and blunt bead-shaped ptery-
goid processes. The mandible resembles more that of Lophuromys
in the shape of its coronoid process, which is long and slender and
very different from the minute projection which is found in Acomys.
The condylar process is considerably larger than in either Lophu-
romys or Acomys. The most marked difference, however, is the
prominence given to the incisor capsules. In this genus the capsule
forms a prominent shelf-like projection midway between the coro-
noid and the condylar processes. The incisor condyle of Acomys and
NO. I 7 NEW SPECIES OF EAST AFRICAN RODENTS HELEER
Lophuromys is scarcely perceptible on the surface of the posterior
portion of the ramus. This genus has the external characters of
Lophuromys with the palatal skull formation of : A corny s and dis-
tinctive projecting incisors and marked mandibular characters.
ACOMYS HYSTRELLA, new species
Gray-backed Spiny Mouse
Type from Nimule, Uganda; adult female, number 164821, U. S.
Nat. Mus. ; collected by J. Alden Loring, February 4, 1910; original
Characters. — Size large ; tail three-fourths head and body ; dorsal
coloration drab gray with fulvous sides; nasal bones short.
Coloration. — Median dorsal region from the snout to the base of
the tail drab-gray, this color merging gradually into the fulvous
of the sides; fulvous of cheeks, lower sides, and legs sharply defined
against the white of the under parts. Spinous hair of sides annu-
lated, the extreme tip seal brown, succeeded by a broad band of
fulvous, which is followed by cinereous gray to the base ; this annu-
lation is not perceptible in the darker spines of the back, the sub-
terminal band of drab-gray being nearly as dark as the tips. Feet
white. A small white spot below the ear. Ears smoky-brown
clothed with a mixture of minute brownish and silvery hairs. Tail
sharply bicolor; above lighter gray than the back, below whitish.
Under parts, including upper lips and feet, white, the hair white to
Measurements. — Head and body, in mm.; tail, 81 ; hind foot, 16;
ear, 15. Skull: greatest length, 28.3; basilar length, 22; zygomatic
breadth, 13.2; nasals, 10.5x3.5; interorbital constriction, 5; length
of palatine foramina, 6.7; length of upper tooth row, 4.5.
From the Somali species, mullah, this species differs in its smaller
size, more fulvous sides, and shorter tail and nasal bones. The ful-
vous sides also distinguish it from the grayish cahirinus of Egypt,
from which it further differs by larger skull and acutely pointed
mesopterygoid fossa and smaller bulke.
DASYMYS ORTHOS, new species
Nyanza Swamp Rat
Type from Butiaba, Albert Nyanza, Uganda; adult male, number
164824, U. S. Nat. Mus. : collected by J. Alden Loring, January x,
1910; original number, 8601.
SMITHSONIAN MISCELLANEOUS COLLECTIONS
Characters - — Antorbital plate with a straight anterior margin,
with scarcely any concavity; bullae small, coloration brownish; size
Coloration. — General dorsal coloration Prout’s brown, becoming
grayer on the sides and merging gradually into the olive-yellow
wash of the gray under parts. Dorsal pelage made up of long
black hairs which overlay the nearest shorter ones, which are
terminally seal brown, then broadly tawny and basally slate. Limbs
light wood brown. Tail showing very little hair, the amiulation
conspicuous, color broccoli brown.
Measurements. — Head and body 160 mm.; tail, 156; hind foot,
32. Skull: condylo-incisive length, 36.5; zygomatic breadth, 18.5;
nasal, 13.5; palatal foramina, 8; length tympanic bulla?, 5.6; length
upper toothrow, 7.3; diastema, 11.2; condylo-incisive length of
This species is a much browner species than medius , with larger
body size. The skull differs decisively from a large series of
helnkus from British East Africa in its straight-edged antorbital
plate, which is scarcely more angulated at its upper edge than
in Epimys alexandrinns .
There is one other specimen from Butiaba in the collection, and
a third from Rhino Camp.
DASYMYS SAVANNUS, new species
Kenia Swamp Rat
Type from Fort Hall, British East Africa; adult female, number
164471, U. S. Nat. Mus.; collected by J. Alden Loring, October 28,
1909; original number, 8182.
Characters. — Coloration umber-brown, skull with antorbital plate
much angulated and produced, giving the antorbital vacuity great
depth; size smaller than in helnkus; tail essentially naked.
Coloration. — Upper parts umber, overlaid medially with black,
the individual hairs tawny-ochraceous, with dark brown tips and
slaty bases mixed with longer black hairs. Sides lighter, purer
ochraceous, becoming more grayish where they meet the olive-gray
wash of the lower parts. Feet pale brown. Ears hair brown,
clothed with minute grayish hairs. Tail like the ears in color, but
quite naked, with the annuli showing conspicuously.
Measurements. — Head and body, 156 mm.; tail, 146; hind foot,
29.5. Skull : condylo-incisive length, 37.5 ; zygomatic breadth, 19 ;
NO. 1 7 NEW SPECIES oE EAST AFRICAN RODENTS — HEEEER IS
nasal, 14; palatal foramina, 8.5; length of bullae, 6; upper tooth-
row, 7.5; diastema, 12.5; condylo-incisive length of mandible, 28.
This species is very much browner than hclukus, with a less hairy
tail in old age, and smaller body size. The angle of the antorbital
plate is much more pronounced than in any other specimen in the
collection. Interorbital region narrow, the beads on margin much
raised and leaving a deep median groove.
A large series of specimens show the age differences in skulls to
be great. The interorbital region changes from a flat, weakly
beaded condition to a narrow, deeply concave affair with high beads.
Bulke in youth high and rounded, becoming in age flat and broad,
antorbital plate less concave in young.
MUNGOS SANGUINEUS ORESTES, new subspecies
Kenia Forest Mungoose
Type from west slope of Mt. Kenia, altitude 8,500 feet; adult
male, number 164152, U. S. Nat. Mus. ; collected by J. Alden Lor-
ing, October 12, 1909; original number, 7934.
Characters. — Much darker and larger than sanguineus , with black
predominating on the dorsal surface ; skull larger and wider zygo-
Coloration . — Median dorsal area from snout to tip of tail black-
ish ; top of head and tip of tail wholly black; back and sides mixed
tawny and black, the black predominating; feet like back, only the
toes black; sides of face black like the crown. Under parts mixed
tawny and dark brown, the tawny predominating.
Measurements. — Head and body, 300 mm.; tail, 282; hind foot,
59. Skull: condylo-basal length, 65; palatal length, 34; zygomatic
breadth, 34.5 ; width of brain case, 26.5 ; greatest diameter of pm 4 , 8.
The series of six topotypes shows considerable variation. The
darkest one has the head feet and median line of the back wholly
black. The lightest one is somewhat darker than normal specimens
of sanguineus. This new race is nearest to proteus of Mt. Ruwen-
zori, which lives in very similar environment. It has a longer tail
and larger skull, and is much less blackish.
SMITHSONIAN MISCELLANEOUS COLLECTIONS
CROSSARCHUS FASCIATUS COLONUS, new subspecies
East African Banded Mungoose
Type from the Southern Guaso Nyiro River, Sotik District, Brit-
ish East Africa; adult female, number 162132, U. S. Nat. Mus. ;
collected by Edmund Heller, June 21, 1909; original number, 6396.
J. Alden Loring.
Characters . — Size and proportions as in macritras , but coloration
much grayer, the rufous of the shoulders replaced by buffy gray
and the feet seal brown.
Coloration . — General dorsal coloration buffy grayish, lined every-
where with blackish ; the posterior back and rump marked by eleven
dark cross bands which are well defined only on back, being obso-
lete on the sides. Separating the broad dark cross bands are nar-
rower light bands of buffy, which on median line become ferrugi-
nous. Shoulders and limbs uniform in color with the general body
color, the feet and the muzzle dor sally from the level of the eyes
dark seal brown. Tail like body color, the terminal one- fourth
blackish. Under parts with an ochraceous wash, the hairs basally
dark brown ; throat lighter buffy, the chin and upper lip bright
tawny, in marked contrast to rest of under parts.
Measurements . — Head and body, 380 mm.; tail, 260; hind foot, 92.
Skull : condylo-basal length, 7 5.5 ; basal length, 71 ; zygomatic
breadth, 42.5 ; palatal length, 39; greatest diameter of pm 4 , 7.
This East African veldt race of the banded mungoose is a much
grayer and lighter colored animal than macrurus of Ruwenzori and
Uganda. The rich rufous suffusion of the shoulders and the black
feet of the latter are wanting, the body color being quite uniform
and the black replaced by brown.
These mungooses are often met with on the grassy plains of the
Sotik country, where they live in colonies in burrows on the open
veldt. They, however, do not stop long in any locality, but move
about in small packs of ten to twenty individuals, which take up a
temporary abode in any nest of burrows which they find convenient.
From our observations it was apparent that they do not remain more
than a day or two in any one set of burrows.